Ovarian cysts are sacs that form on or inside the ovary. A fluid-filled ovarian cyst is a simple cyst. A complex ovarian cyst contains solid material or blood. Simple cysts are common. They develop ...

A hemorrhagic ovarian cyst is a type of ovarian cyst that bleeds. Smaller cysts that do not cause symptoms may go away without treatment. However, a person may need surgery to remove a large or ...

A chocolate cyst is an ovarian cyst filled with old blood, which is why it has a dark brown coloring. Chocolate cysts occur when endometrial-like tissues form sacs on the ovaries. Endometriosis causes ...